Three ways.
(1) Large corporations offer a generous severance package. 18 months of full pay and full benefits is not uncommon for someone with 10 years at the company. Plus, they might pay tuition for new training. They might offer office space while you job search. And almost all companies offer a 12 month contract with a professional job search firm.
(2) Job recommendation - a future employer is legally allowed to request four items of information from a past employer. The dates of your employment. Job title. Pay. Eligible for re-hire? If you fail to train your replacement, your current employer will tell all future employers you are NOT eligible re-hire. That's a huge black mark on your record, and your current employer has NO legal obligation to explain why you are not eligible.
(3) You must sign a full non-disclosure agreement before you receive your severance package and your eligibility for re-hire. If you break that agreement, they will sue to recover all money from the severance package, and you will instantly become NOT eligible for re-hire.
Very insightful... Thanks so much.